Notes

In some earlier versions, the onstat -h command does not show up in the normal onstat command usage.

Monitoring and Tuning

Tuning to the hash chain is performed indirectly by tuning the number of buffers. As pages
are read into the buffer pool, the page number is hashed to a value for one of the hash buckets.
Since there are only a limited number of hash buckets, multiple page numbers will hash to the same
value and thus the same hash bucket, creating a chain. Although the onstat -h command doesn't
show the length of each individual hash bucket, it does show the total number of hash buckets
with a particular length.